He probably wont remember if the accident investigator was wearing his "Investigators Hat", I beleive the way our state sees "color of authority and headgear" I dont think it will matter if the LE that gave him his tickets etc. was wearing his hat..As dor chain of custody, he might have a good case for dismissal, but he would have to prove that someone who handled the "evidence" was in violation of the HAT/HEADGEAR requirement...
"TO PROTECT THE SHEEP FROM THE WOLVES, YOU HAVE TO THINK AND ACT LIKE A WOLF"